THE FRESH-WATER LOCHS OF SCOTLAND. 
405 
depth, 24J feet, and by the fact that two-thirds of the area of the loch is 
less than 25 feet deep. Both ends are shallow beyond the two narrows 
which constrict the loch, the deepest part in the north-east portion being 
26 feet, and in the south-west portion 32 feet. Both the narrows are 
20 feet deep. The central basin between the narrows is deep, and the 
25-feet and 50-feet contours follow the shore and enter the west bay. 
The greater part of the basin is over 25 feet deep, the 50-feet area being 
nearly half a mile long, but narrow. The 75-feet basin is based on a 
single sounding in 75 feet, the maximum depth of the loch. 
Loch nan Lann (see Plate XCI.). — A small loch of relatively great 
depth, situated between Loch Knockie and Loch Ness, joined with Loch 
Knockie by a short stream a quarter of a mile long. Loch nan Lann 
lies due north and south, and is narrow towards the north and broad 
towards the south end. There is a constriction in the middle of the 
loch, with a small and shallow expansion to the north of it, and a broad 
and deep basin to the south. The axis of the loch is considerably 
curved. The east shore is wooded. The length is nearly three-quarters 
of a mile, the greatest breadth one-third of a mile, and the mean 
breadth about one-seventh of a mile. The superficial area is about 
65 acres, and the contents amount to 105 millions of cubic feet. The 
drainage area includes Loch Knockie, and amounts to 3| square miles. 
It is fed chiefly by the burn from Loch Knockie, The outgoing stream 
leaves the loch at the north extremity, and flows half a mile north- 
westwards into Loch Ness. 
North of the narrows the loch is deeper close to the west shore, and 
the greatest depth in this part is 41 feet. South of the narrows the 
expanded portion is a regular and simple basin. The contours are 
fairly concentric with the sides of the basin, the slope pretty uniform 
all round, but rather more gradual from 25 to 50 feet. The narrow 
100-feet area is an eighth of a mile long, and is a very little to the 
south-west of the centre. The maximum depth is 109 feet. The loch 
is approximately 645 feet above the sea. 
The temperature at the surface on April 24, 1903, was 42°-0 Fahr. ; 
at 15 feet, 41°-8 ; at 25 feet, 41°-3; at 50 feet, 41°*0; and at 100 feet, 
41°*0, the whole range being 1°. 
Loch Kemp (see Plate XCI.). — ^A small loch east of Loch Ness, 
3 miles to the south of Foyers. It is of rather irregular form, roughly 
oblong, with an arm running off to the north, and bays to the east and 
west. The shore is entirely of rock, and it is surrounded by low hills. 
The length is half a mile, the greatest breadth a quarter of a mile, the 
mean breadth scarcely less (one-fifth of a mile). The superficial area 
is about 68 acres, and the volume of water 77 millions of cubic feet. 
The drainage area is IJ square miles. Two small burns enter to the 
